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// This may look like C, but it's really -*- C++ -*-
// ========================================================================
//
// = LIBRARY
// TAO
//
// = FILENAME
// arg_shifter
//
// = AUTHOR
// Seth Widoff
//
// = VERSION
// $Id$
// ========================================================================
#if !defined (TAO_ARG_SHIFTER_H)
#define TAO_ARG_SHIFTER_H
class Arg_Shifter
// = TITLE
// Happy ADT to shift known args to the back of the argv vector,
// so deeper levels of argument parsing can locate the yet
// unprocessed arguments at the beginning of the vector.
//
// = DESCRIPTION
// The Arg_Shifter copies the pointers of the argv vector into a
// temporary array. As the Arg_Shifter iterates over the temp, is
// places known arguments in the rear of the argv and unknown
// ones in the beginning. So, after having visited all the
// arguments in the temp vector, Arg_Shifter has placed all the
// unknown arguments in their original order at the front of
// argv.
{
public:
Arg_Shifter (int &argc, char **argv, char **temp = 0);
// Sumbit to the Arg_Shifter the vector over which to iterate, also
// providing the temporary array if the client doesn't want the
// arg_shifter to dynamically allocate its own. If internal dynamic
// allocation fails, the Arg_Shifter will set all the indices to the
// end of the vector, forbidding iteration. Following iteration over
// argv, the argc value will contain the number of unconsumed
// arguments.
~Arg_Shifter (void);
char* get_current (void) const;
// Get the current head of the vector.
int consume_arg (int number = 1);
// Consume <number> argument(s) by sticking them/it on the end of
// the vector.
int ignore_arg (int number = 1);
// Place <number> arguments in the same relative order ahead of the
// known arguemnts in the vector.
int is_anything_left (void) const;
// Returns the number of args left to see in the vector.
int is_option_next (void) const;
// Returns 1 if there's a next item in the vector and it begins with
// '-'.
int is_parameter_next (void) const;
// Returns 1 if there's a next item in the vector and it doesn't
// begin with '-'.
int num_ignored_args (void) const;
// Returns the number of irrelevant args seen.
private:
int &argc_;
// The size of the argument vector.
int total_size_;
// The size of argv_.
char **temp_;
// The temporary array over which we traverse.
char **argv_;
// The array in which the arguments are reordered.
int current_index_;
// The element in <temp_> we're currently examining.
int back_;
// The index of <argv_> in which we'll stick the next unknown
// argument.
int front_;
// The index of <argv_> in which we'll stick the next known
// argument.
};
#endif /* TAO_ARG_SHIFTER_H */
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